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प्रश्न
Out of Lu(OH)3 and La(OH)3 which is more basic and why?
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उत्तर
- As we move from Ce3+ to Lu3+, the basic character of Lu3+ ions decreases.
- Due to the decrease in the size of Lu3+ ions, the ionic character of the Lu – OH bond decreases, covalent character increases which results in the decrease in the basicity.
- Hence, La(OH)3 is more basic than Lu(OH)3.
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संबंधित प्रश्न
Write the general outer electronic configuration of f- block elements.
Which of the following lanthanoid ions is diamagnetic?
Which of the following oxidation states is most common among the lanthanoids?
Assertion: Ce4+ is used as an oxidizing agent in volumetric analysis.
Reason: Ce4+ has the tendency of attaining +3 oxidation state.
The actinoid elements which show the highest oxidation state of +7 are ____________.
Justify the position of lanthanides and actinides in the periodic table.
Which of the following is not an actinoid?
The elements in which electrons are progressively filled in 4f-orbital are called ______.
In the modern periodic table, elements are arranged in order of increasing atomic numbers which is related to the electronic configuration. Depending upon the type of orbitals receiving the last electron, the elements in the periodic table have been divided into four blocks, viz, s, p, d and f. The modern periodic table consists of 7 periods and 18 groups. Each period begins with the filling of a new energy shell. In accordance with the Arfbau principle, the seven periods have 2, 8, 8, 18, 18, 32 and 32 elements respectively. The seventh period is still incomplete. To avoid the periodic table being too long, the two series of f-block elements, called lanthanoids and actinoids are placed at the bottom of the main body of the periodic table.
The elements with atomic numbers 35, 53 and 85 are all ______.
Electronic configurations of four elements A, B, C and D are given below:
(A) 1s22s22p6
(B) 1s22s22p4
(C) 1s22s22p63s1
(D) 1s22s22p5
Which of the following is the correct order of increasing tendency to gain electron:
